Process of making artificial stone.



0. UUIVHUSI l IUNS,

COATING R 'PLASTIC.

Lead Oxid (IiTharq 2) UNITED STATES PATENT OFFICE.

ROBERT CONN AND OTTO HUGO SHULTZ, OF VERNON, BRITISH COLUMBIA, CANADA.

PROCESS OF MAKING ARTIFICIAL STONE.

No Drawing.

To all whom it may concern:

Be it known that we, ROBERT CONN and O'rro H. SHULTZ, citizens ofCanada, residing at Vernon, in the Province of British Columbia andDominion of Canada, have invented new and useful Improvements inProcesses of Making Artificial Stone, of which the following is aspecification.

Our invention relates to a process of making artificial stone.

The object of the invention is to provide a process by which artificialmarble or other stone may be produced in exact simulation of the naturalstones, and whereby artificial stone which is both fire and water proof.of maximum strength and durability and of great density may be easilyand conveniently produced.

In carrying our invention into practice, we first take one part ofconcentrated sulfuric acid and three pal-mm 5 and mix the two iogetlierin a sui a e vessel, the mixture being stirred thoroughly until reartiop ceases. fWe then 5 re are a solution 0 1 5 arts 0 ma eiur rl chloridin 226 parts of er. 5113 add is sou 10 to the mixture ormed from thesulfuric acid and lumbic oxid stirring contlnuously all the while untllreaction again ceases. We also prepare a dry mixture of 210 parts ofcalciu fate (satin spar), a 'nesium car n par s, and sand or rave par 5.ese are thoroughly mmogether in a dry state, and

to this dry mixture is added the wet mixture of sulfuric acid. lumhic oxid, and magnesium chlorid whic are thorou'gdily combined by agitation ina suitable vessel. The wet mixture in the process of combination is 40gradually added to the dry mixture, and the mass thoroughly stirred or a'tated until all reaction ceases. In the com ination of the two mixturesit is essential to efiect the mixture under a thorough stirring oragitation,

on account of the reactions which occur,

whereby certain gases such as carbon dioxid are formed, which must be 1erated from the mixture and allowed tg egcgpein order to prevent thecorhpositidn om becoming pggonsTand preventing the particles from propery setting. As soon as all reaction of the mass ceases the composition iscompleted and ready for use, such composition bem in a plastic conditionso that it may be ed 85 within molds for the production of stones orarticles of the desired shapes.

n-wan.

Specification of Letters Patent.

Patented Sept. '7, 1915.

Prior to its introduction into the mold the composition is allowed tocool to a temperature of from 70 to 80 F., at which temperature thecomposition is best adapted for the molding operation. The molds may beof any suitable form and construction, for the production of differentkinds of artificial rocks or stones. For the production of stones havinga glazed surface, glass or polished metal molds are used. For theproduction of stones having a dull surface molds of wood and other cheapmaterial satisfactorily fulfil the purpose. The composition is allowedto remain in the mold until it has set to a desired degree, which occursin from 10 to 12 hours.

For the production of colored stones when so desired, ve etablc; in d esmay be adde to the dry mixturl%5$- sition. For a color or tint, thecolorin matter may be added to the dry mixture efore adding the acid,lithg 'ge and magnesium chlorid. In producing artificial marble or otherstreaked or grain stones, the color is added to the mixture after it ispoured into the molds, the design being produced by means of paddles orsuitable brushes.

By the use of the materials and process described, we produce anartificial marble or other stone which not only closely simulates thenatural stone, but which is moisture and fire-proof and of greatdensity, hardness, and durability. The stone so produced withstands aheat test of approximately 700 F., and a crushing pressure ofapproximately 3,000 lbs, and is also impervious to moisture and toatmospheric changes. We find that this is due to the character of theingredients and especially to the method of combination whereby allgases are eliminated and the particles of the mass allowed to setwithout voids or the retention of air or gases. The proportions givenare thus found best adapted for the purpose, although we find that theymay be varied to some considerable degree, and thence we do not limitthe proportions to those particularly defined.

We claim The herein-described process of making an artificial stonecomposition, which consists in mixin one part of concentrated sulfuric acicl'wit 3 parts of plgmbicpxid and 'sti'fr'ui'g ui'itilieaction ceases,dissolving 17 5 parts of magnesium chlorid in 226 parts ofwater,.-amf1"gtlie'olution a; the mixture and stirring continuouslyuntil reaction again ceases, preparing a dry mixture of 210 parts Intestimony whereof We aflix our signaof calcium sulfate, 105 parts ofmagnesium tures in presence of two Witnesses. ci lllqnate, and 280 partsof sand, adding the ROBERT CONN.

wet mixture first prepared to the dry mix- OTTO HUGO SHULTZ. ture, andstirring the mass to eliminate all gases in combining the mixtures untilall reaction ceases.

Witnesses PETER DICKSON, ARTHUR SMITH.

Copies of this patent may be obtained for five cents each, by addressingthe Commissioner of Patents,

Washington, D. C.

